Marcus Grodi and Msgr. Jeffrey Steenson continue their study of Against Heresies by St. Ireneaus of Lyons, looking more into Book IV of this important early Christian work.

In his opposition to Gnostics, Marcionites, and other heretical groups, St. Irenaeus mentions a number of reasons why the apostolic deposit of faith should be trusted rather than innovations and new interpretations by leaders who impose their own opinions on the Gospel. He also emphasizes the importance of free will in allowing us to respond to God's love with our own love, and why that matters from a theological and philosophical perspective.

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